| 1 | /*
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| 2 | * volume_id - reads filesystem label and uuid
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| 3 | *
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| 4 | * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the GNU Lesser General Public
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| 8 | * License as published by the Free Software Foundation; either
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| 9 | * version 2.1 of the License, or (at your option) any later version.
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| 10 | *
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| 11 | * This library is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | * Lesser General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU Lesser General Public
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| 17 | * License along with this library; if not, write to the Free Software
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| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 19 | */
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| 20 |
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| 21 | //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_LINUXRAID) += linux_raid.o
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| 22 |
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| 23 | //config:
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| 24 | //config:config FEATURE_VOLUMEID_LINUXRAID
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| 25 | //config: bool "linuxraid"
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| 26 | //config: default y
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| 27 | //config: depends on VOLUMEID
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| 28 | //config: help
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| 29 | //config: TODO
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| 30 | //config:
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| 31 |
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| 32 | #include "volume_id_internal.h"
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| 33 |
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| 34 | struct mdp_super_block {
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| 35 | uint32_t md_magic;
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| 36 | uint32_t major_version;
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| 37 | uint32_t minor_version;
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| 38 | uint32_t patch_version;
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| 39 | uint32_t gvalid_words;
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| 40 | uint32_t set_uuid0;
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| 41 | uint32_t ctime;
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| 42 | uint32_t level;
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| 43 | uint32_t size;
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| 44 | uint32_t nr_disks;
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| 45 | uint32_t raid_disks;
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| 46 | uint32_t md_minor;
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| 47 | uint32_t not_persistent;
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| 48 | uint32_t set_uuid1;
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| 49 | uint32_t set_uuid2;
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| 50 | uint32_t set_uuid3;
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| 51 | } PACKED;
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| 52 |
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| 53 | #define MD_RESERVED_BYTES 0x10000
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| 54 | #define MD_MAGIC 0xa92b4efc
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| 55 |
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| 56 | int FAST_FUNC volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size)
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| 57 | {
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| 58 | typedef uint32_t aliased_uint32_t FIX_ALIASING;
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| 59 | #define off ((uint64_t)0)
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| 60 | uint64_t sboff;
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| 61 | uint8_t uuid[16];
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| 62 | struct mdp_super_block *mdp;
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| 63 |
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| 64 | dbg("probing at offset 0x%llx, size 0x%llx",
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| 65 | (unsigned long long) off, (unsigned long long) size);
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| 66 |
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| 67 | if (size < 0x10000)
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| 68 | return -1;
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| 69 |
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| 70 | sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
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| 71 | mdp = volume_id_get_buffer(id, off + sboff, 0x800);
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| 72 | if (mdp == NULL)
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| 73 | return -1;
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| 74 |
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| 75 | if (mdp->md_magic != cpu_to_le32(MD_MAGIC))
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| 76 | return -1;
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| 77 |
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| 78 | *(aliased_uint32_t*)uuid = mdp->set_uuid0;
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| 79 | memcpy(&uuid[4], &mdp->set_uuid1, 12);
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| 80 | volume_id_set_uuid(id, uuid, UUID_DCE);
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| 81 |
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| 82 | // snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
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| 83 | // le32_to_cpu(mdp->major_version),
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| 84 | // le32_to_cpu(mdp->minor_version),
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| 85 | // le32_to_cpu(mdp->patch_version));
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| 86 |
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| 87 | dbg("found raid signature");
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| 88 | // volume_id_set_usage(id, VOLUME_ID_RAID);
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| 89 | IF_FEATURE_BLKID_TYPE(id->type = "linux_raid_member";)
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| 90 |
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| 91 | return 0;
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| 92 | }
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